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<!DOCTYPE html>
<html>
<head>
<title>Drag and Drop GeoJSON File onto Map - Azure Maps Web SDK Samples</title>
<meta charset="utf-8" />
<meta http-equiv="x-ua-compatible" content="IE=Edge" />
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no" />
<meta name="description" content="This sample shows how load add support for dragging and dropping GeoJSON files on to the map and having them render." />
<meta name="keywords" content="map, gis, API, SDK, GeoJSON, drag, drop, dropover, FileReader" />
<meta name="author" content="Microsoft Azure Maps" />
<!-- Add references to the Azure Maps Map control JavaScript and CSS files. -->
<link rel="stylesheet" href="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.css" type="text/css" />
<script src="https://atlas.microsoft.com/sdk/javascript/mapcontrol/2/atlas.min.js"></script>
<script type='text/javascript'>
var map, datasource, popup;
function GetMap() {
//Initialize a map instance.
map = new atlas.Map('myMap', {
view: 'Auto',
//Add your Azure Maps subscription key to the map SDK. Get an Azure Maps key at https://azure.com/maps
authOptions: {
authType: 'subscriptionKey',
subscriptionKey: '<Your Azure Maps Key>'
}
});
//Wait until the map resources are ready.
map.events.add('ready', function () {
//Add the Style Control to the map.
map.controls.add(new atlas.control.StyleControl({
//Optionally specify which map styles you want to appear in the picker.
//All styles available with the S0 license tier appear by default in the control.
//If using a S1 tier license, you can use the mapStyles option to add the 'satellite' and 'satellite_road_labels' styles to the control.
mapStyles: ['road', 'road_shaded_relief', 'grayscale_light', 'night', 'grayscale_dark', 'satellite', 'satellite_road_labels']
}), {
position: "top-right"
});
//Setup the drag & drop listeners on the map.
var dropZone = document.getElementById('myMap');
dropZone.addEventListener('dragover', handleDragOver, false);
dropZone.addEventListener('drop', handleFileSelect, false);
//Create a data source to store the data in.
datasource = new atlas.source.DataSource();
map.sources.add(datasource);
//Add a layer for rendering the polygons.
var polygonLayer = new atlas.layer.PolygonLayer(datasource, null, {
fillColor: '#1e90ff',
filter: ['any', ['==', ['geometry-type'], 'Polygon'], ['==', ['geometry-type'], 'MultiPolygon']] //Only render Polygon or MultiPolygon in this layer.
});
//Add a click event to the layer.
map.events.add('click', polygonLayer, featureClicked);
//Add a layer for rendering line data.
var lineLayer = new atlas.layer.LineLayer(datasource, null, {
strokeColor: '#1e90ff',
strokeWidth: 4,
filter: ['any', ['==', ['geometry-type'], 'LineString'], ['==', ['geometry-type'], 'MultiLineString']] //Only render LineString or MultiLineString in this layer.
});
//Add a click event to the layer.
map.events.add('click', lineLayer, featureClicked);
//Add a layer for rendering point data.
var pointLayer = new atlas.layer.SymbolLayer(datasource, null, {
iconOptions: {
allowOverlap: true,
ignorePlacement: true
},
filter: ['any', ['==', ['geometry-type'], 'Point'], ['==', ['geometry-type'], 'MultiPoint']] //Only render Point or MultiPoints in this layer.
});
//Add a click event to the layer.
map.events.add('click', pointLayer, featureClicked);
//Add polygon and line layers to the map, below the labels..
map.layers.add([
polygonLayer,
//Add a layer for rendering the outline of polygons.
new atlas.layer.LineLayer(datasource, null, {
strokeColor: 'black',
filter: ['any', ['==', ['geometry-type'], 'Polygon'], ['==', ['geometry-type'], 'MultiPolygon']] //Only render Polygon or MultiPolygon in this layer.
}),
lineLayer, pointLayer
], 'labels');
//Add the point layer above the labels.
map.layers.add(pointLayer);
//Create a popup but leave it closed so we can update it and display it later.
popup = new atlas.Popup({
position: [0, 0]
});
});
}
function handleDragOver(evt) {
//Stop the browser from performing its default behavior when a file is dragged and dropped.
evt.stopPropagation();
evt.preventDefault();
evt.dataTransfer.dropEffect = 'copy';
}
function handleFileSelect(evt) {
//Stop the browser from performing its default behavior when a file is dragged and dropped.
evt.stopPropagation();
evt.preventDefault();
//Remove any existing data from the map.
datasource.clear();
//The list of files that have been dragged and dropped onto the map.
var files = evt.dataTransfer.files;
//Keep track of the bounding box of all the data from all files dropped into the map.
var dataBounds = null;
//Loop through and attempt to read each file.
for (var i = 0; i < files.length; i++) {
var reader = new FileReader();
reader.onload = function (e) {
try {
var geojsonData = JSON.parse(e.target.result);
//Add the GeoJSON data to the data source.
datasource.add(geojsonData);
//Calculate the bounding box of the GeoJSON data.
var bounds = atlas.data.BoundingBox.fromData(geojsonData);
//If data is already loaded from another GeoJSON file, merge the bounding boxes together.
if (dataBounds) {
dataBounds = atlas.data.BoundingBox.merge(dataBounds, bounds);
} else {
dataBounds = bounds;
}
//Update the map view to show the data.
map.setCamera({
bounds: dataBounds,
padding: 50
});
} catch (e) {
alert('Unable to read file as GeoJSON.');
}
};
//Read the file as text.
reader.readAsText(files[i]);
}
}
function featureClicked(e) {
//Make sure the event occurred on a shape feature.
if (e.shapes && e.shapes.length > 0) {
//By default, show the popup where the mouse event occurred.
var pos = e.position;
var offset = [0, 0];
var properties;
if (e.shapes[0] instanceof atlas.Shape) {
properties = e.shapes[0].getProperties();
//If the shape is a point feature, show the popup at the points coordinate.
if (e.shapes[0].getType() === 'Point') {
pos = e.shapes[0].getCoordinates();
offset = [0, -18];
}
} else {
properties = e.shapes[0].properties;
//If the shape is a point feature, show the popup at the points coordinate.
if (e.shapes[0].type === 'Point') {
pos = e.shapes[0].geometry.coordinates;
offset = [0, -18];
}
}
//Update the content and position of the popup.
popup.setOptions({
//Create a table from the properties in the feature.
content: '<div style="padding:10px;max-height:200px;overflow-y:auto;">' + object2Table(properties) + '</div>',
position: pos,
pixelOffset: offset
});
//Open the popup.
popup.open(map);
}
}
function object2Table(obj) {
//Create a HTML table from an objects property names and values.
var html = ['<table><tr><td><b>Property</b></td><td><b>Value</b></td><tr>'];
Object.keys(obj).forEach(function (key, index) {
//Ignore private properties which are commonly denoted using an underscore.
if (key.indexOf('_') !== 0) {
html.push('<tr><td>', key, '</td><td>');
if (typeof obj[key] === 'object') {
//If the value of the property is an object, create a sub-table recursively.
html.push(object2Table(obj[key]));
} else {
html.push(obj[key]);
}
html.push('</td><tr>');
}
});
html.push('</table>');
return html.join('');
}
</script>
</head>
<body onload="GetMap()">
<div id="myMap" style="position:relative;width:100%;min-width:290px;height:600px;"></div>
<fieldset style="width:calc(100% - 30px);min-width:290px;margin-top:10px;">
<legend>Drag and Drop GeoJSON File onto Map</legend>
This sample shows how load add support for dragging and dropping GeoJSON files from your local computer file system on to the map and having them render on the map.
<br/>
<ul>
<li><a href="https://catalog.data.gov/dataset?q=geojson" target="_blank">Data.gov</a></li>
<li><a href="http://boundaries.latimes.com/sets/" target="_blank">Mapping L.A. Boundaries API</a></li>
<li><a href="https://github.com/search?q=geojson" target="_blank">GitHub</a></li>
</ul>
<br/>Here are some great places to find GeoJSON files to try out. You can also create your own GeoJSON files by drawing on a map <a href="http://geojson.io" target="_blank">here</a>.
</fieldset>
</body>
</html>
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